Well, I've been thinking about this as well, and I have a contribution to make to the discussion.

So at the beginning of the series, Twilight lives in Canterlot and moves to Ponyville, right? So this high school campus Twilight ends up in could be the human equivalent of Ponyville, and the other Twilight could be in the human equivalent of Canterlot, or just a different school.

On another thread, somepony told me that Human Pinkie mentioned another human resembling Twilight, inferring that Twilight did have a human double after all.

But did she have a human double? If so, did she enter the mirror to Equestria around the same time pony Twilight entered it into the human world? I mean, if you're going to enter a parallel universe, it should have your own double, rather than just doubles of the people you know and love.

Hello there. I have merged your topic with an earlier one that was wondering whether there was already a human version of Twilight Sparkle before the pony version traveled through the mirror. I have also edited the title of the older thread slightly.

There's a comic floating around somewhere that has an explanation for that. I'll post it here if I happen to find it in the next few minutes

**Edit**

Found it. Here's what happened.

Spoiler

Haha, eeyup. I'm using that as the basis of my first MLP fanfic, though I do a few things differently. One of the trailers briefly shows a grouped picture of the human Main 5 (a version of the one Celestia receives in the opening theme), with Human!Twilight being conspicuously absent. If Human!Twilight appears in the movie, my guess is she'd be in an epilogue scene after Alicorn!Twilight returns to Equestria.

It seems to me that Spike probably does not have a counterpart in the HumanVerse. In the second trailer there's a scene where someone is shocked that Dog!Spike talks. This implies that only ponies have human counterparts, since the only non-pony sapient who goes through the mirror comes out as a different, normally non-sapient species in the HumanVerse. Since an ordinary dog can't be a research assistant/butler, Human!Twilight apparently doesn't have her own equivalent of Spike.

No we don't, and it says nothing about her at all not even a subtle hint which really bugs me. I hear they are going to make a comic though so that might go into it and if not people will undoubtedly write fanfics about it.

Whats the deal with Sunset Shimmer constantly mentioning she was going to ruin Twilight like she did the last girl that stood in her way? Who was the last girl who stood in Sunset's way? Can someone explain that?

What if Sunset Shimmer is actually Twilight's human self, the anti-Twilight as you see that came out of the human world to steal the pro-Twilight's crown? That would explain so much if that was true.

See Sunset=Twilight Shimmer=Sparkle. They have to be related in some way. I'm guessing Sunset Shimmer is actually the human version of Twilight that came out of the mirror. What if when the people come out, they turn evil? That would explain why Sunset is th villian.

What if Sunset Shimmer is actually Twilight's human self, the anti-Twilight as you see that came out of the human world to steal the pro-Twilight's crown? That would explain so much if that was true.

See Sunset=Twilight Shimmer=Sparkle. They have to be related in some way. I'm guessing Sunset Shimmer is actually the human version of Twilight that came out of the mirror. What if when the people come out, they turn evil? That would explain why Sunset is th villian.

I haven't seen the movie but spoiled myself a lot. Sunset Shimmer was Celestia's Student. In Pony world. She is technically a Pony, as far as I know.